[Bug 753751] Dashdemux: returned seekable range for live streams is not usable

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=753751

--- Comment #6 from A Ashley <bugzilla at ashley-family.net> ---
For a live DASH stream, you can access fragments between "now" and "now -
timeshiftBufferDepth".

The GST_QUERY_SEEKING query for a DASH stream will respond with start and end
position based upon the current time of day. For example if the query arrived
at 10:00:00am and the timeshiftBufferDepth was 60 seconds, the response from
dashdemux would be:

start = 09:59:00
stop = 10:00:00

One second later, a call to seek is made using the start value from the query
response. By this time, the seek range has moved to:
start = 09:59:01
stop = 10:00:01

Therefore the seek fails, because the requested seek position is before the
earliest possible seek position.

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